Fuel cell system

a fuel cell and system technology, applied in the field of fuel cell systems, can solve the problems of reducing output power, and difficult to remove impurities such as metal ions

Inactive Publication Date: 2006-10-26
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, the activity of a catalyst layer in the fuel electrode of the unit cell is deteriorated to cause a decrease in the output power.
However, it is difficult to sufficiently remove the impurities, particularly metal ions, even by cleaning the fuel electrode of the DMFC of the recycling type by supplying the chelating agent described in Jpn. Pat. Appln. KOKAI Publication No. 2004-227844.
It is also difficult to remove the impurities such as metal ions even by employing cleaning of water in the DMFC of the recycling type as disclose in Jpn. Pat. Appln. KOKAI Publication No. 2004-213978.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

OF THE CLEANING LIQUID

[0058] Cleaning liquid A (300 mL) was prepared by dissolving 0.5% by weight of 12-crown-4 represented by structural formula (A) below and 10% by weight of N,N-dimethylformamide in water.

preparation example 2

OF THE CLEANING LIQUID

[0059] Cleaning liquid B (300 mL) was prepared by dissolving 0.5% by weight of 15-crown-5 represented by structural formula (B) below and 10% by weight of N,N-dimethylformamide in water.

preparation example 3

OF THE CLEANING LIQUID

[0060] Cleaning liquid C (300 mL) was prepared by dissolving 0.5% by weight of 18-crown-6 represented by structural formula (C) below and 10% by weight of N,N-dimethylformamide in water.

[0061] (Assemble of Fuel Cell Stack)

[0062] An anode (a fuel electrode) was formed by thermal compression bonding of a platinum-ruthenium catalyst layer and a diffusion layer containing carbon powder-carbon paper on one surface of a perfluoroalkylsulfone membrane (trade name Nafion 112 membrane, manufactured by DuPont Co.) in this order. A cathode (an air electrode) was formed by thermal compression bonding of a platinum catalyst layer and a diffusion layer containing carbon powder-carbon paper on the other surface of the perfluoroalkylsulfone membrane in this order to prepare a membrane electrode unit with an electrode surface area of 5 cm2. Subsequently, a carbon separator having columnar flow passageways and a current collector were laminated on both surfaces of the membran...

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PUM

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Abstract

According to one embodiment, a fuel cell system includes a cell unit having a plurality of laminated single cells, a circulating pipeline connected to a fuel electrode of each single cell of the cell unit, a cartridge fuel tank attachably and detachably disposed on the circulating pipeline and filled with a fuel comprising an aqueous methanol solution, a cleaning liquid tank attachably and detachably disposed on the circulating pipeline and filled with a cleaning liquid containing a particular cyclic organic compound as a detergent, a fuel pump disposed on the circulating pipeline, and flow passageway switching means for discharging the cleaning liquid after cleaning the fuel electrode of the cell unit, the switching means being disposed on a downstream side of the cell unit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2005-125407, filed Apr. 22, 2005, the entire contents of which are incorporated herein by reference. BACKGROUND [0002] 1. Field [0003] One embodiment of the present invention relates to a fuel cell system. [0004] 2. Description of the Related Art [0005] A direct methanol fuel cell (DMFC) has a structure comprising a membrane electrode unit, and a plurality of laminated unit cells including a fuel flow passageway plate and oxidative gas flow passageway plate disposed on both faces of each membrane electrode unit. The membrane electrode unit comprises a fuel electrode to which a mixed solution of methanol and water is supplied as a fuel, an air electrode to which oxidative gas is supplied, and a polymer electrolyte membrane interposed between these electrodes. [0006] DMFCs are classified into a fuel circulating type for circulating the f...

Claims

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Application Information

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IPC IPC(8): H01M8/04
CPCH01M8/04H01M8/04186Y02E60/523H01M8/1011H01M8/04208Y02E60/50
InventorARIMURA, TOMOAKI
OwnerKK TOSHIBA